Pileus Git - ~andy/gtk/blob - gtk/gtkcssinheritvalue.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2011 Red Hat, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "config.h"
  19
  20 #include "gtkcssinheritvalueprivate.h"
  21
  22 #include "gtkcssstylepropertyprivate.h"
  23 #include "gtkstylecontextprivate.h"
  24
  25 struct _GtkCssValue {
  26   GTK_CSS_VALUE_BASE
  27 };
  28
  29 static void
  30 gtk_css_value_inherit_free (GtkCssValue *value)
  31 {
  32   /* Can only happen if the unique value gets unreffed too often */
  33   g_assert_not_reached ();
  34 }
  35
  36 static GtkCssValue *
  37 gtk_css_value_inherit_compute (GtkCssValue        *value,
  38                                guint               property_id,
  39                                GtkStyleContext    *context,
  40                                GtkCssDependencies *dependencies)
  41 {
  42   GtkStyleContext *parent = gtk_style_context_get_parent (context);
  43
  44   *dependencies = GTK_CSS_DEPENDS_ON_EVERYTHING;
  45
  46   if (parent)
  47     return _gtk_css_value_ref (_gtk_style_context_peek_property (parent, property_id));
  48   else
  49     return _gtk_css_value_compute (_gtk_css_style_property_get_initial_value (_gtk_css_style_property_lookup_by_id (property_id)),
  50                                    property_id,
  51                                    context,
  52                                    NULL);
  53 }
  54
  55 static gboolean
  56 gtk_css_value_inherit_equal (const GtkCssValue *value1,
  57                              const GtkCssValue *value2)
  58 {
  59   return TRUE;
  60 }
  61
  62 static GtkCssValue *
  63 gtk_css_value_inherit_transition (GtkCssValue *start,
  64                                   GtkCssValue *end,
  65                                   double       progress)
  66 {
  67   return NULL;
  68 }
  69
  70 static void
  71 gtk_css_value_inherit_print (const GtkCssValue *value,
  72                              GString           *string)
  73 {
  74   g_string_append (string, "inherit");
  75 }
  76
  77 static const GtkCssValueClass GTK_CSS_VALUE_INHERIT = {
  78   gtk_css_value_inherit_free,
  79   gtk_css_value_inherit_compute,
  80   gtk_css_value_inherit_equal,
  81   gtk_css_value_inherit_transition,
  82   gtk_css_value_inherit_print
  83 };
  84
  85 static GtkCssValue inherit = { &GTK_CSS_VALUE_INHERIT, 1 };
  86
  87 GtkCssValue *
  88 _gtk_css_inherit_value_new (void)
  89 {
  90   return _gtk_css_value_ref (&inherit);
  91 }